Add option 'lz4' for compression in zfs module

For defaults that are integers, enforce it for config supplied values.

If a user supplies a string in the config (rather than an int), the code
should fix that- or blow up immediately- rather than allowing that value to
work it's way down and break w/in the connection object; when that happens,
the actual error is opaque and requires pdb.set_trace() to run down.

"make webdocs" sphinx output is now clean.  Edit passes and additional content in docs still pending.

Start of organizing variable section.  This is all still in progress and not done, need to fix links between sections and re-add see-also sections, etc, etc.

The patterns document is now it's own chapter since it applies to playbooks and /usr/bin/ansible alike.

tests shouldn't be making symlinks to system dirs, also fixes unit test report on OS X.

Use set_setting in rax.py inventory module

Prevent UnicodeEncodeError: 'ascii' codec can't encode characters in pos...

changelog: be clear, host module is not related to ansible inventory

Allow storing input from user in a pause prompt